[3] There are however two surviving examples in the United Kingdom's Royal Armories, including a novel improvement in the flintlock's function and safety features in the 1786 model, that also saw the inclusion of a contained port fire ignited by the first shot.
[1] While no examples of the converted muskets demonstrated to Congress are known, Belton did not give up on the concept of superposed load firearms.
Belton then began making superposed load flintlocks, which used a sliding lock mechanism, with the London gunsmith William Jover, and provided one or more examples to the British army for teseting.
An example of a seven shot sliding lock flintlock musket made by Jover and Belton may be found in the Royal Armouries Museum collection in Leeds.
A hybrid of a flintlock and a matchlock, it is provided with a "portfire", which is a section of slow burning cannon fuse held in a small cylinder.
[7] Today there are two surviving Belton and Jover pistols at the Pitt Rivers Museum at the University of Oxford, having four touch holes which permit four successive discharges.